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That's easy, when I understood you correctly. Take a look! I think, you went to far inside with your tool to make the NPT thread, so the inner pump body where the gears run over, is slightly damaged. The area under the pump outlet is important. Maybe a little edge is bended, just clean the edge with a fine files, maybe a piece of fine sandpaper would help, too. Put the gears in and if you turn them with two fingers, it has to move easier. make it as long, as you feel something rough, clean all parts after every grind! That's it!
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